package com.lw.sbdemo2.common.utils;

import java.security.MessageDigest;

/**
 * md5加密
 *
 * @author sjf
 */
public class MD5Util {
    public final static String encode(String s) {
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 再次加密
     *
     * @author LinWang
     * @createTime 2016-5-14
     * @param s
     * @return
     */
    public final static String encodeLW(String s) {
        String temp = "";
        temp = encode(s);
        temp = temp.replace('1', '#');
        temp = temp.replace('2', '1');
        temp = temp.replace('3', '2');
        temp = temp.replace('4', '3');
        temp = temp.replace('5', '4');
        temp = temp.replace('6', '5');
        temp = temp.replace('7', '6');
        temp = temp.replace('8', '7');
        temp = temp.replace('9', '8');

        return temp;
    }

    public static void main(String[] args) {
    }
}
